Re: [RFC PATCH 00/16] x86/split_lock: Enable #AC exception for split locked accesses

[Dave Hansen]

On 06/21/2018 03:08 PM, Peter Zijlstra wrote:
> On Thu, Jun 21, 2018 at 03:00:03PM -0700, Fenghua Yu wrote:
>> The control knob for kernel is to choose re-executing the faulting
>> instruction (default) or kernel panic. Kernel panic may be useful in hard
>> real time which has less tolerant to bad performance.
> The kernel should never trigger this, ever. Any #AC is a plain bug and
> should be fixed. So unconditional WARN+disable is suffient.

It sounds like we need to start with that functionality and then if
Fenghua wants to do more, we have add-on patches that can be evaluated
by themselves.